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Assume that you have two pumps, one that pumpswater at a rate of 1 liter s-1, the other at a rate of 2liter s-1. For each pump find out how long it would take to reduce the salt concentration from the
A helicopter, starting from rest, accelerates straight up from the roof of a hospital. The lifting force does work in raising the helicopter. An 780-kg helicopter rises from rest to a speed of 6.9 m
A capacitor (capacitance C1) is connected across the terminals of an ac generator. Without changing the voltage or frequency of the generator, a second capacitor (capacitance C2) is added in series
For a mercury column barometer tomeasure atmospheric pressure as 760 mm Hg, the column containing the mercury must be completely evacuated.
You pull a 12-kg box across the floor with a strap that is at an angle of 45° above the horizontal. Find the normal force and the tension in the strap, given that the box moves with constant spe
The net ionic equation for the aqueous neutralization reaction between acetic acid and sodium hydroxide is different from that for the reaction between hydrochloric acid adn sodium hydroxide. Explai
What is the gravitational potential energy of the basketball, relative to the ground when it is released?
A batted baseball leaves the bat at an angle of 37 degrees above the horizontal and is caught by an outfielder 120m from the plate. The x-axis is horizontal, and they y-axis is vertical. What is th
Suppose a mixture contains helium and oxygen gases. If the partial pressure is the same as the partial pressure of oxygen, what do you know about the number of helium atoms compared to the number of
A yo-yo has a rotational inertia of 790 g·cm2 and a mass of 95 g. Its axle radius is 2.2 mm and its string is 100 cm long. The yo-yo is thrown so that its its initial speed down the string is
Why is it important to know amount of water in a petroleum product?(i.e. the free water and the dissolved and emulsifiedwater) Why is important to know the amount of water and the amount of sediment
A block is pulled up a frictionless 30 degrees incline by an applied force of 25 N parallel to the surface of the incline. If the mass of the object is 3.0 kg what is the magnitude of the accelerat
Birds of the order Galliformes (i.e., fowl, pheasant, grouse, quail, & turkey) tend to have relatively light colored breast meat, whereas birds of the order Anseriformes (i.e., ducks and geese)
A thin-walled sphere rolls along the floor. What is the ratio of its translational kinetic energy to its rotational kinetic energy through its center of mass?
A 9.4-cm-diameter, 402 g sphere is released from rest at the top of a 0.7-m-long, 25° incline. It rolls, without slipping, to the bottom. What fraction of its kinetic energy is translational?
Determine the mass of a nonvolatile, nonionizing compound that must be added to 4.21 kg of water to lower the freezing point to 98.70 degrees celsius. The molar mass of the compound is 50.0 g/mol an
A long horizontal wire carries 16.0 A of current due north. A. What is the absolute value of the net magnetic field 21.0 cm due west of the wire if the Earth's field there points north but downward,
An object that is 31 cm in front of a convex mirror has an image located 19 cm behind the mirror. How far behind the mirror is the image located when the object is 19 cm in front of the mirror?
Would a reaction occur if a piece of Sn metal were placed in a ZnSO4 solution? Briefly explain your answer. Write a net ionic equation if a reaction does occur.
A 47 resistor can dissipate up to 0.27 W of power without burning up. What is the smallest number of such resistors that can be connected in series across a 9.0 V battery without any one of them bur
There was no reaction between lead(II) sulfate solution (PbSO4) and Cu metal, but there was a reaction between PbSO4 solution and Zn metal.
Two converging lensees, the first with focal length 25 cm and second with the focal length 20 cm, are separated by 30 cm. A 4 cm tall object is placed 50 cm infront of the first lens. What is the he
A 20.0 kg package slides down a 36.0 degree incline and accelerates at 0.273 m/s^2. Find the friction force impending its motion. Also, How large is the coefficient of friction?
Enter the net ionic equation for the reaction of aqueous sodium chloride with aqueous silver nitrate. Express your answer as a chemical equation.
Determine the delay time between the application of the electric pulse and the onset of activation potential.